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I've had a few failures with Federal Automatch. Too bad I have soo much of it.

When I test my 22/45 for function I use CCI SV or Mini Mags. They always function 100%.

Even 1 out of 100 is not good. Your gun should fire Every time.
And so do I, along with many other savvy Ruger Mark pistol owners. CCI Mini-Mags are the BEST benchmark that can be used to test a Ruger Mark pistols function. Why is that? Because those rounds are so dog-gone reliable, and if you have any functional hiccups with Mini-Mags, you know, it's more often than not, a mechanical issue.

Some will try and argue with that, but that's normally just a bunch of flatulence to foul the air and cause strife. Most know the record of those two by now. ;)
 

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I installed one of the new firing pins into my Ruger Mark III Hunter this afternoon and grabbed a full box of Federal Auto-Match.



Using 4 magazines where I loaded each magazine twice with 10 rounds each time, I had absolutely no failures to fire, but I did have one stovepipe and one failure to feed. This pistol was not cleaned after the previous testing a couple of days ago, and the factory extractor is still in this pistol.

After 80 rounds of Federal Auto-Match, and each rim was hit perfectly and deep enough to my satisfaction. No failures to fire. I did polish the very top edge of the firing pin, and then polished the bottom edge of the recoil spring assembly brace that the firing pin slides across. The firing pin does not ride upward as one previous post erroneously reported that they do.

 

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Was to eliminate FTF's with Automatch. There may be some other factor for my results,
perhaps my mainspring is weak? or something else. I did receive the new/old style
firing pin I ordered and measured it in comparison to my original and the new pin and found that the LOA on it was 1.977 as compared to the old and new at 1.975.
So the new style is .002 shorter and my old pin had worn/peened by .002. The new/old style pin is in now and I will use it in the next match and then also test it
with Automatch.
Stew,

I have a couple of suggestions you might try, if you don't mind. When you have some time, send me an email at [email protected]. That way I can send clear pictures from a camera to maybe help with a solution.

There are actually a myriad of things that can, and will, cause light primer hits.
 

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Measuring and comparing the over-all length of each firing pin doesn't take into account where, and how, the firing pin stop pin hole is located in each firing pin. It would be a lot to ask for if that firing pin stop pin location would be the same for every firing pin Ruger has made. That location also controls "firing pin protrusion", which is more important. So, the difference of 0.0020 inch may not mean much, if anything at all.

More important to me, is how deep the rim hit is by the firing pin tip. That can all be calculated once you know what headspace measurement is, firing pin protrusion distance and then rim thickness of the rimfire ammunition you're using.

If anyone is interested in a simple technique used to measure .22 rimfire rim thickness, here's a fairly easy method:



I use a .223 fired case. A .22 rimfire round will slip into the case mouth very easily. I faced the head of the case off to make sure it was perpendicular to the centerline.



Measure the overall length of the cartridge case.



Set your calipers at "ZERO".



Install a cartridge into the 223 case mouth and then measure the case rim thickness.
 

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I put in the new firing pin, an extractor and Clark trigger about 3-4 weeks ago in my 1979 RST. I tested the pistol the same day I installed the parts and had nary a problem.

After seeing this second post about FTFs w/Fed AM I carried a 125 rounds of AM to the range yesterday. I took my Medalist and the RST for a little target practice. I ran 100 rounds through the Medalist with no anomalies. We have the annual shoot off in bowling pins in another week so I am trying to improve my time and accuracy. With rapid fire I had not FTFs with the AM.

I had planned to try 3 brands of ammo with the RST [AM, Win SuperX & CCI MiniMags]. I had to cut my session short, but I did run 25 rounds of Fed AM through the RST before I left. I was shooting fairly rapidly, reloading a magazine as I emptied it for the 25 rounds. Again, I had no FTFs or any other inconsistency.

I am running a little test with the AM, which I will put in a different post in the ammo section. I am shooting the AM in various pistols from a specific 325 round retail package to see if I have any issues. Frankly, I don't think I will.

I got about 2/3s of the way through a 100 box of CCI MMs in a Pins shoot last Monday and had a FTF with my Medalist on the 4th of 6 pins. That rather surprised me and made a quick round into a mediocre round with lost time ejecting the FTF round. In a typical string, 7 rounds are loaded for a 6 pin string allowing an extra shot if needed if a pin is missed, or more time damaging, a FTF and having to eject that round and continue the string.

VH :eek:man:
VH,

It's always GOOD to read excellent, HONEST, reports such as yours. You're one of those around RFC whose long time experience can be trusted to be accurate, and helpful.

Too bad RFC allows wanna-be's to post ridiculous stories about shooting "billions" of rounds of .22 ammunition without any issues, or get ¼ inch groups at 200 yards with their Ruger Mark III Standard using Russian rimfire ammunition.
 

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In some of my experiments in the not so long ago past, with mainspring housing springs that were done long before we had as many "negative Nancy's" as we do these days around here, I found some springs available through "Wolf Gunsprings" that had a higher pound rating than those they actually sell for the Ruger Mark pistol mainspring housing assembly.

I even posted comparison pictures with all the pertinent dimensions involved that provided those springs with the extra pound rating to drive the hammer a bit faster and with more strength to detonate the priming compound for these Ruger Mark pistols. I even had a couple of "beta testers" willing to try mainspring housing assemblies that I set up with the proviso they would return those with an honest report as to what they found, be it good or BAD. All reported GOOD results with those springs installed. It's too bad that we can't do those sort of experiments these days due to the few who'd rather deny and argue about something they know nothing about or have even tried to use.
 
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